Theme = percentage

Hey, i'm doing some stuff on percentage, and i'd just like to clarify somethings, if that's okay???:I have to find the simple interest on: $620 at 8.5% p.a. for 2 years. I have so far as workings is concerned: i = p*r*t/100 = 620 * 8.5 * 24/100i can't figure out weather i multiply the rate by the time or divide it!also: i don't have a clue how to do this, i'm not really that good at these: $3500 at 9% p.a. for 3 years, 9 months.

and also to clarify one more thing: Steve received an extra $36.75 in his pay packet after receiving a pay rise of 71/2%calculate:a) Steve's wage before his pay rise: (my workings so far) 7.5 divided by 100 (relating %, you know how the % can be a 100) * 36.75 = 2.76b) steve's wage now--???

Hey, i'm doing some stuff on percentage, and i'd just like to clarify somethings, if that's okay???:I have to find the simple interest on: $620 at 8.5% p.a. for 2 years. I have so far as workings is concerned: i = p*r*t/100 = 620 * 8.5 * 24/100i can't figure out weather i multiply the rate by the time or divide it!

...
and also to clarify one more thing: Steve received an extra $36.75 in his pay packet after receiving a pay rise of 71/2%
calculate:
a) Steve's wage before his pay rise: (my workings so far) 7.5 divided by 100 (relating %, you know how the % can be a 100) * 36.75 = 2.76
b) steve's wage now--???

Hello,

to a):

You know that 7.5% are the same as $36.75. Calculate the money related to 1%:
$36.75 / 7.5% = $4.9 per percent.

He has received a 100% pay. Thus he got $4.9 * 100 = $490

to b):
He now get an additional pay of $36.75. Therefore his pay is now: $490 + $36.75 = $526.75

Hey, i'm doing some stuff on percentage, and i'd just like to clarify somethings, if that's okay???:I have to find the simple interest on: $620 at 8.5% p.a. for 2 years. I have so far as workings is concerned: i = p*r*t/100= 620 * 8.5 * 24/100i can't figure out weather i multiply the rate by the time or divide it!also: i don't have a clue how to do this, i'm not really that good at these: $3500 at 9% p.a. for 3 years, 9 months.

and also to clarify one more thing: Steve received an extra $36.75 in his pay packet after receiving a pay rise of 71/2%calculate:a) Steve's wage before his pay rise: (my workings so far) 7.5 divided by 100 (relating %, you know how the % can be a 100) * 36.75 = 2.76b) steve's wage now--???

Thanks,

yes.yours is correct.620*85*24/100*10=31*17*24/10=527*245/10=12648/10=1264.8$ is the answer.